Post-fork Minor Updates
Post-fork Minor Updates

Adds in new checkpoints at or past block 1,600,000. Disconnects pre-fork
protocol versions. Version updated to 8.3.1

Emerald-Crypto/emerald,Open-Source-Coins/emd,Open-Source-Coins/emd,Emerald-Crypto/emerald,Open-Source-Coins/emd,Emerald-Crypto/emerald,Emerald-Crypto/emerald,Open-Source-Coins/emd